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/*
File: file_shp.c
Copyright (C) 2023 Grzegorz Szymaszek <gszymaszek@short.pl>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_shp)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@
@ requires valid_register_header_check(file_stat);
@*/
static void register_header_check_shp(file_stat_t *file_stat);
const file_hint_t file_hint_shp= {
.extension="shp",
.description="ESRI Shapefile",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_shp
};
static const uint8_t shp_header[4] = {0x00, 0x00, 0x27, 0x0a};
/* https://en.wikipedia.org/wiki/Shapefile */
struct shp_header
{
int32_t magic;
int32_t reserved[5];
uint32_t size;
int32_t version;
int32_t shape_type;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size >= sizeof(struct shp_header);
@ requires separation: \separated(&file_hint_shp, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ ensures (\result == 1) ==> (file_recovery_new->file_stat == \null);
@ ensures (\result == 1) ==> (file_recovery_new->handle == \null);
@ ensures (\result == 1) ==> (file_recovery_new->time == 0);
@ ensures (\result == 1) ==> (file_recovery_new->extension == file_hint_shp.extension);
@ ensures (\result == 1) ==> (file_recovery_new->calculated_file_size >= 100);
@ ensures (\result == 1) ==> (file_recovery_new->file_size == 0);
@ ensures (\result == 1) ==> (file_recovery_new->min_filesize == 100);
@ ensures (\result == 1) ==> (file_recovery_new->data_check == &data_check_size);
@ ensures (\result == 1) ==> (file_recovery_new->file_check == &file_check_size);
@ ensures (\result == 1) ==> (file_recovery_new->file_rename == \null);
@ assigns file_recovery_new->filename[0];
@ assigns file_recovery_new->time;
@ assigns file_recovery_new->file_stat;
@ assigns file_recovery_new->handle;
@ assigns file_recovery_new->file_size;
@ assigns file_recovery_new->location.list.prev;
@ assigns file_recovery_new->location.list.next;
@ assigns file_recovery_new->location.end;
@ assigns file_recovery_new->location.data;
@ assigns file_recovery_new->extension;
@ assigns file_recovery_new->min_filesize;
@ assigns file_recovery_new->calculated_file_size;
@ assigns file_recovery_new->data_check;
@ assigns file_recovery_new->file_check;
@ assigns file_recovery_new->file_rename;
@ assigns file_recovery_new->offset_error;
@ assigns file_recovery_new->offset_ok;
@ assigns file_recovery_new->checkpoint_status;
@ assigns file_recovery_new->checkpoint_offset;
@ assigns file_recovery_new->flags;
@ assigns file_recovery_new->extra;
@ assigns file_recovery_new->data_check_tmp;
@*/
static int header_check_shp(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
const struct shp_header *shp=(const struct shp_header *)buffer;
const uint64_t size = (uint64_t)2 * be32(shp->size);
if(le32(shp->version) != 1000)
return 0;
if(size < 100)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_shp.extension;
file_recovery_new->min_filesize=100;
file_recovery_new->calculated_file_size=size;
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
return 1;
}
static void register_header_check_shp(file_stat_t *file_stat)
{
register_header_check(0, shp_header, sizeof(shp_header), &header_check_shp, file_stat);
}
#endif
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